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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70e38218a24d8ccc35d122c8f95b9dfb962dc3cf209ed206872c089c5f4424da' 
  AND token = 'gk8znQkKnwE43QRnlo/RS7yltcrWt7pikh04e+46Bgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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