SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f16cb85a35e77f1406614b2d6b824e35d0f8d0027feb3c4bd63a30e8d61f9b62' 
  AND token = 'iN4hOkure+mYKjWk45AdnxKhg4Bgsnz3M5+REA5gMpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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