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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f55a5dab2515e71b50d9dbcd09442dff9d7d5f9459cacb77e68ecf531bb68bca' 
  AND token = 'G4YB7hRSULdWmGKcQBgP10ncbeuS5oaX7AqYH/bWh1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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