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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9034644aa2cbe8fac8168650313688695e1d319b2c2ac767f123845f4868e8cd' 
  AND token = '4I2hDCg6hFXOwD9Ar99LslmAt8mRY82pjkZE1na4k9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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