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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '548565c3e8e94cd7a2d7d28f366d346b3a8342abdb3f290d6f0d9fb7a81add59' 
  AND token = 'oazXgsuzgftHE3Lz9DwjELlmZdtuZjs58LoavPI3TLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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