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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d5d0ab9ef8e2ae8e75bdb83439fee0b4abc38a541e6143048a0f1fa544752e9' 
  AND token = 'VwngtuwzVNlOxL1EW8/UXq0OLq8hNmqZe3IzNxqZ6TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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