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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb63dcd0bff71c68c0bfbaa003ac97aeb77a7906799e61e08a59acd260064ef4' 
  AND token = 'WPWmObuZLVCRcV2Dy67h94QGufIeEp2ALQ+Mu5nskXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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