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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bf3a9907a2409e879fa2a1f0dc68182be0114ee95d6877f17b83c365b5e7d0b' 
  AND token = '4WCih/j7NfPPN7yt8xLUqGDTi/bZgVBf7e0FZ9WpydQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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