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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df3f552f767bdb35fa537b497623994769a4fcfe86fab5a2b2542d377135442e' 
  AND token = 'klkfAKDEJoY1cEuymsoPe1SGNRkrp71nlwKJVvRhkb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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