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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd46ca3626d72192c6b54f609641d433b44be9f4af7f13e0796a318ead137d62' 
  AND token = 'hHmF1H8iSFth9T76joM05A5OqLo2hvJlrr+iX1zO8fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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