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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51a12efab35934d75aeea6a74652fdd61b821ec5f9543e40b79c08532d19b864' 
  AND token = 'DNCb0z1APE0V9gwV/g0NJ68Khw4fT8DA7+yrgC2yFpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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