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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a59da4b5889e8596b8d01d21f9c3de8a928bef9d19c3c4a7d492669ecbf11780' 
  AND token = 'VQdHunc7jCtZaX3okrRze69htW+HDAPkB9MU7mYkBGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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