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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e99929638d9c68607320d98972206447f2d1304bafb9fd5e90d1812314b6f2f' 
  AND token = 'zWqMJEjlR1loMRxjlru0nRdztgBKDeg09ARoPAcAKEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}