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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '871530e35fc010b42cc908ec0c6e41f948a20904be95dccb611976ff53b395e3' 
  AND token = '1OA7LUO48gKLio/+6GZ4NaecX27dUL+Zk4XTlqbprFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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