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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f5df32609d6aae0a1b95e378f76f5c80dce2c105eccfeb5d96fa696b65babbd' 
  AND token = 'f0j2UavAbOYZddgizKehABzWXJTu7d7VwtMLV4h4h2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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