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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67b18181bd573d7fd09b05beb5953c6c11d3c38492376f7ce53794bef3bc1c1b' 
  AND token = 'Oh62bSUmiIhDHTkyxeWJMGW4/LtTVDtpVQgHRH8rMO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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