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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd799894bfd27ade5aa185fe81b5efd383731cb408d15fc030d586251b11311f2' 
  AND token = 'esHHDUfiHgF81c17XVCXX7IR5kRAOeh1p/kh8YLDD4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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