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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f77b4bb5496c37dd7d3afdbea61f141ebc1bbc4e5f65bf0f1935c15c8eeff01' 
  AND token = '/12KAr+gD6KGl7hAqOax79mB7sgZyMaFMTiNesPdxek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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