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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e54b3f24e78a8774ead3fa6267edd763c8a70183ed1df3e14c307ac75c760d0' 
  AND token = 'xsllZW2CklSYGap9VqxFBEqGTztRKWbR3GW0NHHrn10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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