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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fba7176b5b9bd1ed9313db412a401b53d843516f976e4a88abc58a1664dc7b4' 
  AND token = '0IQ/U7TWu5XiJeHgXk3NkpQFuLEe/VsrapQCwSzV7GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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