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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d91c9c9e24cde060faf5b9e67d2c82fff96779c1bb8a202539d238078ac1b57' 
  AND token = '2QLrfOpgDnYb/LvWM0RxeuopEHMsv1+aShfCfUaJafk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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