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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c40c2e3a1030b5df018a96c38ecd3f87c4833552c0f873aea2bdb10c769bf915' 
  AND token = 'mlgMQcgzjydy3Dl9iNIiSaIeGtpmsg+rqmXhVCF06PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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