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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b3681b2af038009ba1a196e1e1213b24b10cf753e4c79040ccd8118986c23f5' 
  AND token = 'aRTAIlFld8bevuTDMFplEv6qmK9mekPHcF5QYfCq5JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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