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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46979ac942a60a3530ef1a7ea42440e6235551dce5bf08c9efe3045c8a4e049a' 
  AND token = 'roio4WT+WDvbsnA5Nn3feAPI6sZ+dQ+fPZNC9fMaSlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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