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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '169e3ad7cb35a7709a2efba5e832e1e5d97920ca1a17113ddaee9d1db6b819bf' 
  AND token = 'Axfy5mkvpS5mjJ5AUqy0n6gVw2vh/DKnBVJYoARqmeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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