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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28003ee9d68eac89f776febebe0cc2e275136008fec2e4c81d9cf789ef74d22d' 
  AND token = 'xnbmsjpkWhjYF8u+KyjhS6ur1b3KAtPI5WB/p5h7sQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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