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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51f0ca7c73e906b2cb3760afc5dd0998b71fd990834d162531e6b68c9449f92f' 
  AND token = '4AvpJBNV68B6V8LpetkFdo9VWPaqd9mraBJ9uuW5NyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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