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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f513f40b234de5a114b6124418d3c9b08bae3a6352c3fdc7ce3b0377d0a33021' 
  AND token = 'vL9eYzTlm4EFHAdBuBexu4/BdcPOYvCkLJb0BUCpa2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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