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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88f2b7a7437ceefb43083bd7001e796a99465bd26d776a38dfecf0e83f092288' 
  AND token = '6YNC3NFcMoH7Y46XjsEIG+mNbW5Zj/1FqGUXsxmocIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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