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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3aa8824955a90f6d2dd1c419a541470b16fa15cb1243c45321921301acf57ca2' 
  AND token = 'ULsG0aWrERRVvkH7RGN49LGFIeGGKlJm5Ghxd+IMKT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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