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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03be8a36ee3087043724a086fe80d71fc9d82de0e2a9eeaf45cdbdf3318da790' 
  AND token = 'h5agRSySnfcptA0GJqXjPLjED7WH7obV9ob1QOQTUPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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