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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dac1c529914b3b04718d5f233c15be8325feb49ba3d1ddfd100443998d0bde14' 
  AND token = 'abwq0PR8tV1Cc5s8Du+ZiLcLSofHTl4TklIscRh3o+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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