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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c5f2aa96f716271aafc551a47278417501d2a25346150172c202284bb516438' 
  AND token = 'OZu3i8Unxey+rv3vbj7ycMN9LchvzWmOFg7Ghdiby9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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