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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a764926bdc847c1fdfc49ac5eaac003b962ceb40f689c4478e1dc303f97b1ec1' 
  AND token = 'c40nRkrGN/Ycgvs8pMo6OHInxHBn0Wb2v3Oi14e4ZTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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